diff --git a/.github/release-drafter.yml b/.github/release-drafter.yml
index 67b5f0e1..79522326 100644
--- a/.github/release-drafter.yml
+++ b/.github/release-drafter.yml
@@ -1,5 +1,5 @@
-name-template: 'v1.2.0 🌈'
-tag-template: 'v1.2.0'
+name-template: 'v$NEXT_PATCH_VERSION 🌈'
+tag-template: 'v$NEXT_PATCH_VERSION'
 categories:
   - title: '🆕 Features'
     labels:
diff --git a/internal/protocol/http/fetcher.go b/internal/protocol/http/fetcher.go
index f699f76d..c65a5cd5 100644
--- a/internal/protocol/http/fetcher.go
+++ b/internal/protocol/http/fetcher.go
@@ -151,7 +151,7 @@ func (f *Fetcher) Create(res *base.Resource, opts *base.Options) error {
 		return err
 	}
 	if opts.Extra == nil {
-		opts.Extra = &fhttp.ReqExtra{}
+		opts.Extra = &fhttp.OptsExtra{}
 	}
 	extra := opts.Extra.(*fhttp.OptsExtra)
 	if extra.Connections == 0 {
diff --git a/internal/protocol/http/fetcher_test.go b/internal/protocol/http/fetcher_test.go
index bd703c57..cb3387f2 100644
--- a/internal/protocol/http/fetcher_test.go
+++ b/internal/protocol/http/fetcher_test.go
@@ -142,12 +142,16 @@ func doDownloadReady(f fetcher.Fetcher, listener net.Listener, connections int,
 	if err != nil {
 		t.Fatal(err)
 	}
-	opts = &base.Options{
-		Name: test.DownloadName,
-		Path: test.Dir,
-		Extra: http.OptsExtra{
+	var extra any = nil
+	if connections > 0 {
+		extra = http.OptsExtra{
 			Connections: connections,
-		},
+		}
+	}
+	opts = &base.Options{
+		Name:  test.DownloadName,
+		Path:  test.Dir,
+		Extra: extra,
 	}
 	err = fetcher.Create(res, opts)
 	if err != nil {
diff --git a/pkg/download/downloader.go b/pkg/download/downloader.go
index 1c62f092..ee7289da 100644
--- a/pkg/download/downloader.go
+++ b/pkg/download/downloader.go
@@ -102,7 +102,14 @@ func (d *Downloader) Setup() error {
 
 						current := task.fetcher.Progress().TotalDownloaded()
 						task.Progress.Used = task.timer.Used()
-						task.Progress.Speed = current - task.Progress.Downloaded
+						downloaded := current - task.Progress.Downloaded
+						usedTime := float64(d.refreshInterval) / 1000
+						if downloaded == 0 {
+							task.Progress.Speed = int64(float64(task.Progress.Speed) / (usedTime * 1.55))
+						} else {
+							usedTime := float64(d.refreshInterval) / 1000
+							task.Progress.Speed = int64(float64(current-task.Progress.Downloaded) / usedTime)
+						}
 						task.Progress.Downloaded = current
 						d.emit(EventKeyProgress, task)
 
diff --git a/pkg/download/model.go b/pkg/download/model.go
index 08a9733d..e5c887d7 100644
--- a/pkg/download/model.go
+++ b/pkg/download/model.go
@@ -34,7 +34,7 @@ func (cfg *DownloaderConfig) Init() *DownloaderConfig {
 	}
 
 	if cfg.RefreshInterval == 0 {
-		cfg.RefreshInterval = 1000
+		cfg.RefreshInterval = 500
 	}
 	return cfg
 }
diff --git a/ui/flutter/android/app/build.gradle b/ui/flutter/android/app/build.gradle
index 04721767..9fd7e9fe 100644
--- a/ui/flutter/android/app/build.gradle
+++ b/ui/flutter/android/app/build.gradle
@@ -48,7 +48,7 @@ android {
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.
         minSdkVersion 19
-        targetSdkVersion flutter.targetSdkVersion
+        targetSdkVersion 29
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }
diff --git a/ui/flutter/lib/api/model/create_task.dart b/ui/flutter/lib/api/model/create_task.dart
index c874b467..94b3d8b1 100644
--- a/ui/flutter/lib/api/model/create_task.dart
+++ b/ui/flutter/lib/api/model/create_task.dart
@@ -15,7 +15,9 @@ class CreateTask {
     this.opts,
   });
 
-  factory CreateTask.fromJson(Map<String, dynamic> json) =>
+  factory CreateTask.fromJson(
+    Map<String, dynamic> json,
+  ) =>
       _$CreateTaskFromJson(json);
 
   Map<String, dynamic> toJson() => _$CreateTaskToJson(this);
diff --git a/ui/flutter/lib/api/model/downloader_config.g.dart b/ui/flutter/lib/api/model/downloader_config.g.dart
index 7e941e60..9c6fe5fb 100644
--- a/ui/flutter/lib/api/model/downloader_config.g.dart
+++ b/ui/flutter/lib/api/model/downloader_config.g.dart
@@ -64,12 +64,12 @@ ExtraConfigBt _$ExtraConfigBtFromJson(Map<String, dynamic> json) =>
       ..trackerSubscribeUrls = (json['trackerSubscribeUrls'] as List<dynamic>)
           .map((e) => e as String)
           .toList()
-      ..lastTrackerUpdateTime = json['lastTrackerUpdateTime'] == null
-          ? null
-          : DateTime.parse(json['lastTrackerUpdateTime'] as String)
       ..subscribeTrackers = (json['subscribeTrackers'] as List<dynamic>)
           .map((e) => e as String)
           .toList()
+      ..lastTrackerUpdateTime = json['lastTrackerUpdateTime'] == null
+          ? null
+          : DateTime.parse(json['lastTrackerUpdateTime'] as String)
       ..customTrackers = (json['customTrackers'] as List<dynamic>)
           .map((e) => e as String)
           .toList();
@@ -77,6 +77,7 @@ ExtraConfigBt _$ExtraConfigBtFromJson(Map<String, dynamic> json) =>
 Map<String, dynamic> _$ExtraConfigBtToJson(ExtraConfigBt instance) {
   final val = <String, dynamic>{
     'trackerSubscribeUrls': instance.trackerSubscribeUrls,
+    'subscribeTrackers': instance.subscribeTrackers,
   };
 
   void writeNotNull(String key, dynamic value) {
@@ -87,7 +88,6 @@ Map<String, dynamic> _$ExtraConfigBtToJson(ExtraConfigBt instance) {
 
   writeNotNull('lastTrackerUpdateTime',
       instance.lastTrackerUpdateTime?.toIso8601String());
-  val['subscribeTrackers'] = instance.subscribeTrackers;
   val['customTrackers'] = instance.customTrackers;
   return val;
 }
diff --git a/ui/flutter/lib/api/model/options.dart b/ui/flutter/lib/api/model/options.dart
index e8bb5b0a..1b50d37d 100644
--- a/ui/flutter/lib/api/model/options.dart
+++ b/ui/flutter/lib/api/model/options.dart
@@ -2,11 +2,12 @@ import 'package:json_annotation/json_annotation.dart';
 
 part 'options.g.dart';
 
-@JsonSerializable()
+@JsonSerializable(explicitToJson: true, genericArgumentFactories: true)
 class Options {
   String name;
   String path;
   List<int> selectFiles;
+  Map<String, dynamic>? extra;
 
   Options({
     required this.name,
@@ -19,3 +20,14 @@ class Options {
 
   Map<String, dynamic> toJson() => _$OptionsToJson(this);
 }
+
+@JsonSerializable()
+class OptsExtraHttp {
+  int connections = 0;
+
+  OptsExtraHttp();
+
+  factory OptsExtraHttp.fromJson(Map<String, dynamic> json) =>
+      _$OptsExtraHttpFromJson(json);
+  Map<String, dynamic> toJson() => _$OptsExtraHttpToJson(this);
+}
diff --git a/ui/flutter/lib/api/model/options.g.dart b/ui/flutter/lib/api/model/options.g.dart
index 4327f40e..6562554e 100644
--- a/ui/flutter/lib/api/model/options.g.dart
+++ b/ui/flutter/lib/api/model/options.g.dart
@@ -11,10 +11,29 @@ Options _$OptionsFromJson(Map<String, dynamic> json) => Options(
       path: json['path'] as String,
       selectFiles:
           (json['selectFiles'] as List<dynamic>).map((e) => e as int).toList(),
-    );
+    )..extra = json['extra'] as Map<String, dynamic>?;
 
-Map<String, dynamic> _$OptionsToJson(Options instance) => <String, dynamic>{
-      'name': instance.name,
-      'path': instance.path,
-      'selectFiles': instance.selectFiles,
+Map<String, dynamic> _$OptionsToJson(Options instance) {
+  final val = <String, dynamic>{
+    'name': instance.name,
+    'path': instance.path,
+    'selectFiles': instance.selectFiles,
+  };
+
+  void writeNotNull(String key, dynamic value) {
+    if (value != null) {
+      val[key] = value;
+    }
+  }
+
+  writeNotNull('extra', instance.extra);
+  return val;
+}
+
+OptsExtraHttp _$OptsExtraHttpFromJson(Map<String, dynamic> json) =>
+    OptsExtraHttp()..connections = json['connections'] as int;
+
+Map<String, dynamic> _$OptsExtraHttpToJson(OptsExtraHttp instance) =>
+    <String, dynamic>{
+      'connections': instance.connections,
     };
diff --git a/ui/flutter/lib/api/model/request.dart b/ui/flutter/lib/api/model/request.dart
index 7bcc0fe2..cb67416c 100644
--- a/ui/flutter/lib/api/model/request.dart
+++ b/ui/flutter/lib/api/model/request.dart
@@ -2,17 +2,31 @@ import 'package:json_annotation/json_annotation.dart';
 
 part 'request.g.dart';
 
-@JsonSerializable()
+@JsonSerializable(explicitToJson: true, genericArgumentFactories: true)
 class Request {
   String url;
   Map<String, dynamic>? extra;
 
   Request({
     required this.url,
-    this.extra,
   });
 
   factory Request.fromJson(Map<String, dynamic> json) =>
       _$RequestFromJson(json);
+
   Map<String, dynamic> toJson() => _$RequestToJson(this);
 }
+
+@JsonSerializable()
+class ReqExtraHttp {
+  String method = 'GET';
+  Map<String, String> headers = {};
+  String body = '';
+
+  ReqExtraHttp();
+
+  factory ReqExtraHttp.fromJson(Map<String, dynamic> json) =>
+      _$ReqExtraHttpFromJson(json);
+
+  Map<String, dynamic> toJson() => _$ReqExtraHttpToJson(this);
+}
diff --git a/ui/flutter/lib/api/model/request.g.dart b/ui/flutter/lib/api/model/request.g.dart
index a4e60d1b..8e221e84 100644
--- a/ui/flutter/lib/api/model/request.g.dart
+++ b/ui/flutter/lib/api/model/request.g.dart
@@ -8,8 +8,7 @@ part of 'request.dart';
 
 Request _$RequestFromJson(Map<String, dynamic> json) => Request(
       url: json['url'] as String,
-      extra: json['extra'] as Map<String, dynamic>?,
-    );
+    )..extra = json['extra'] as Map<String, dynamic>?;
 
 Map<String, dynamic> _$RequestToJson(Request instance) {
   final val = <String, dynamic>{
@@ -25,3 +24,15 @@ Map<String, dynamic> _$RequestToJson(Request instance) {
   writeNotNull('extra', instance.extra);
   return val;
 }
+
+ReqExtraHttp _$ReqExtraHttpFromJson(Map<String, dynamic> json) => ReqExtraHttp()
+  ..method = json['method'] as String
+  ..headers = Map<String, String>.from(json['headers'] as Map)
+  ..body = json['body'] as String;
+
+Map<String, dynamic> _$ReqExtraHttpToJson(ReqExtraHttp instance) =>
+    <String, dynamic>{
+      'method': instance.method,
+      'headers': instance.headers,
+      'body': instance.body,
+    };
diff --git a/ui/flutter/lib/api/model/resource.dart b/ui/flutter/lib/api/model/resource.dart
index 7d2d3ad2..4b73c46e 100644
--- a/ui/flutter/lib/api/model/resource.dart
+++ b/ui/flutter/lib/api/model/resource.dart
@@ -11,19 +11,19 @@ class Resource {
   int size;
   bool range;
   List<FileInfo> files;
-  Map<String, dynamic>? extra;
+  String hash;
 
-  Resource({
-    required this.req,
-    required this.name,
-    required this.size,
-    required this.range,
-    required this.files,
-    this.extra,
-  });
+  Resource(
+      {required this.req,
+      required this.name,
+      required this.size,
+      required this.range,
+      required this.files,
+      required this.hash});
 
   factory Resource.fromJson(Map<String, dynamic> json) =>
       _$ResourceFromJson(json);
+
   Map<String, dynamic> toJson() => _$ResourceToJson(this);
 }
 
diff --git a/ui/flutter/lib/api/model/resource.g.dart b/ui/flutter/lib/api/model/resource.g.dart
index 5c57df2d..eab7a7c3 100644
--- a/ui/flutter/lib/api/model/resource.g.dart
+++ b/ui/flutter/lib/api/model/resource.g.dart
@@ -14,27 +14,17 @@ Resource _$ResourceFromJson(Map<String, dynamic> json) => Resource(
       files: (json['files'] as List<dynamic>)
           .map((e) => FileInfo.fromJson(e as Map<String, dynamic>))
           .toList(),
-      extra: json['extra'] as Map<String, dynamic>?,
+      hash: json['hash'] as String,
     );
 
-Map<String, dynamic> _$ResourceToJson(Resource instance) {
-  final val = <String, dynamic>{
-    'req': instance.req.toJson(),
-    'name': instance.name,
-    'size': instance.size,
-    'range': instance.range,
-    'files': instance.files.map((e) => e.toJson()).toList(),
-  };
-
-  void writeNotNull(String key, dynamic value) {
-    if (value != null) {
-      val[key] = value;
-    }
-  }
-
-  writeNotNull('extra', instance.extra);
-  return val;
-}
+Map<String, dynamic> _$ResourceToJson(Resource instance) => <String, dynamic>{
+      'req': instance.req.toJson(),
+      'name': instance.name,
+      'size': instance.size,
+      'range': instance.range,
+      'files': instance.files.map((e) => e.toJson()).toList(),
+      'hash': instance.hash,
+    };
 
 FileInfo _$FileInfoFromJson(Map<String, dynamic> json) => FileInfo(
       name: json['name'] as String,